The following C# code example illustrates how to use platform invoke services to play a wave sound file on the Windows platform.
Example
This example code uses DllImport to import winmm.dll's PlaySound method entry point as Form1 PlaySound(). The example has a simple Windows Form with a button. Clicking the button opens a standard windows OpenFileDialog dialog box so you can open a file to play. When a wave file is selected, it is played using the PlaySound() method of the winmm.DLL assembly method. For more information on winmm.dll's PlaySound method, see Using PlaySound to Play Waveform-Audio Files. Browse and select a file with a .wav extension, and then click Open to play the wave file using platform invoke. A text box shows the full path of the file selected.
The Open Files dialog box is filtered to show only files with a .wav extension through the filter settings:
dialog1.Filter = "Wav Files (*.wav)|*.wav";
using System.Windows.Forms;
namespace WinSound
{
public partial class Form1 : Form
{
private TextBox textBox1;
private Button button1;
public Form1() //constructor
{
InitializeComponent();
}
[System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true)]
private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);
[System.Flags]
public enum PlaySoundFlags : int
{
SND_SYNC = 0x0000,
SND_ASYNC = 0x0001,
SND_NODEFAULT = 0x0002,
SND_LOOP = 0x0008,
SND_NOSTOP = 0x0010,
SND_NOWAIT = 0x00002000,
SND_FILENAME = 0x00020000,
SND_RESOURCE = 0x00040004
}
private void button1_Click (object sender, System.EventArgs e)
{
OpenFileDialog dialog1 = new OpenFileDialog();
dialog1.Title = "Browse to find sound file to play";
dialog1.InitialDirectory = @"c:\";
dialog1.Filter = "Wav Files (*.wav)|*.wav";
dialog1.FilterIndex = 2;
dialog1.RestoreDirectory = true;
if(dialog1.ShowDialog() == DialogResult.OK)
{
textBox1.Text = dialog1.FileName;
PlaySound (dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);
}
}
}
}
Compiling the Code
To compile the code
-
Create a new C# Windows Application project in Visual Studio and name it WinSound.
-
Copy the code above, and paste it over the contents of the Form1.cs file.
-
Copy the following code, and paste it in the Form1.Designer.cs file, in the InitializeComponent() method, after any existing code.
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(192, 40);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(88, 24);
this.button1.TabIndex = 0;
this.button1.Text = "Browse";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(8, 40);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(168, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "FIle path";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Platform Invoke WinSound C#";
this.ResumeLayout(false);
this.PerformLayout();
-
Compile and run the code.
Security
See Also